Office (OOXML) / .XLSX malware analysis — malicious · a8969223d2aeb0e1

MALICIOUS

Office (OOXML) / .XLSX

664.4 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-07-27

MD5: 552450e934d1e06b2cc447f9ec2e7c4c SHA-1: 1919d4250a1b0c48374412364b86a8d7fd7d9850 SHA-256: a8969223d2aeb0e15a36b11a5d2428a461973fcc46fa77f0826be73374ac52b4

100 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious File

The file is an Excel document containing an embedded OLE object, specifically identified as a malicious Equation Editor. The OLE object's Ole10Native stream has an anomalous header and a significantly larger declared size than its actual stream size, indicating it likely contains a packed or encrypted payload. The document body itself appears to be a purchase order, potentially a lure to trick the user into opening the malicious content.

Heuristics 3

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/a9DMp.QOzuUO contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
Equation Editor object carries payload-like Ole10Native stream high OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY

Embedded OLE object declares the Equation Editor CLSID but stores a large high-entropy Ole10Native stream with malformed package sizing. This is an exploit-shaped Equation/OLE payload container seen in malicious OOXML samples. It is not assigned to a specific CVE unless the MTEF/Equation Native primitive also matches.
Embedded OLE object medium OOXML_OLE_OBJECT

Document contains an embedded OLE object

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`ooxml_oleobject_00.bin` `f30aa10266a2a50fb825b2fd6c915b139f64dcdfe564d5539d6a8edb220f6f62`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/a9DMp.QOzuUO	977920 bytes
`ooxml_oleobject_00_ole10native_00.bin` `cfd396e2c6e1f4b4ba2d3ad182d52c96060fd332f169803d400ef08a17e5d5db`	ole-package	OOXML xl/embeddings/a9DMp.QOzuUO Ole10Native stream: Ole10NATiVE	968135 bytes

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